Exports of goods and services as % of GDP (most recent) by country

1. Economists comparing exports of goods and services from various countries

2. Collected from 164 different countries, most likely annually, but isn't stated.

3. In terms of the U.S., the U.S.'s percent of goods and services exports of the GDP is 11.24% compared to the average of all 164 countries at 41%

http://www.nationmaster.com/graph/eco_exp_of_goo_and_ser_as_of_gdp-economy-exports-goods-services-gdp